Audio Passthrough for Blackmagic

OmnipotentEntity

OmnipotentEntity

New Member
Is there any option to either pass audio through to the desktop or to tee it to both the stream and desktop for a blackmagic device?

It doesn't seem like there is, so I guess this is a feature request; however, I'm happy to work on it myself. Is there documentation on the codebase, so I can get sensibly orientated?
 
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pkv

Developer
+1 I have exactly the same request ! i'd like ability to record audio in 7.1 ; at the present time, audio from blackmagic is downmixed to stereo.
I am no developper so I can't help; just played a bit with graphedit; wondering if the infinite pin tee filter might help.
 
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pkv

Developer
check this for more orientation from jim:
https://obsproject.com/forum/threads/how-to-create-obs-studio-plugins.53470/

I had a look at the code; first, the decklink plugin is now able to detect multichannel , although it then downmixes to stereo (previously it would capture only the first two channels); so you would have to disable that downmix. I did a quick and dirty compile with disabling the downmixing , enabling 7.1 in the settings > audio menu, and in many other files but i am still missing something. The recording is still stereo ...
 
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pkv

Developer
@OmnipotentEntity
did you select monitoring of the Blackmagic in the audio mixer ?
The audio goes then to your speakers.
You can record independently of OBS through the What You Hear record device present in many sound cards.
If you don't have that you an use instead a virtual audio cable as the monitoring device and enable monitoring of the Blackmagic card in the audio mixer.
This introduces some latency but it works.
(BTW I was able to have multichannel recording working).
 
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pkv

Developer
i wrote a PR enabling surround sound; decklink capture does work now in surround. The PR was merged and the features are available in release 21.
 
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